Dover Wilden Original P1, Engineering, Operation & Maintenance, Page: 9 / 28

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The Pro-Flo
®
model P1 has a 13 mm (1/2") inlet and 13 mm
(1/2") outlet and is designed for flows to 56.8 lpm (15 gpm).
The P1 Plastic pump is manufactured with wetted parts
of pure, unpigmented PVDF, PTFE PFA or polypropylene.
The P1 Plastic is constructed with a polypropylene center
section. A variety of diaphragms and o-rings are available
to satisfy temperature, chemical compatibility, abrasion and
flex concerns.
The suction pipe size should be at least 13 mm (1/2") diam-
eter or larger if highly viscous material is being pumped.
The suction hose must be non-collapsible, reinforced type
as the P1 is capable of pulling a high vacuum. Discharge
piping should be at least 13 mm (1/2"); larger diameter can
be used to reduce friction losses. It is critical that all fittings
and connections are airtight or a reduction or loss of pump
suction capability will result.
INSTALLATION: Months of careful planning, study, and selec-
tion efforts can result in unsatisfactory pump performance if
installation details are left to chance.
Premature failure and long term dissatisfaction can be avoid-
ed if reasonable care is exercised throughout the installation
process.
LOCATION: Noise, safety, and other logistical factors usu-
ally dictate where equipment be situated on the production
floor. Multiple installations with conflicting requirements can
result in congestion of utility areas, leaving few choices for
additional pumps.
Within the framework of these and other existing conditions,
every pump should be located in such a way that five key
factors are balanced against each other to maximum advan-
tage.
ACCESS: First of all, the location should be accessible. If
it’s easy to reach the pump, maintenance personnel will
have an easier time carrying out routine inspections and
adjustments. Should major repairs become necessary, ease
of access can play a key role in speeding the repair process
and reducing total downtime.
AIR SUPPLY: Every pump location should have an air line
large enough to supply the volume of air necessary to
achieve the desired pumping rate (see Section 5). Use air
pressure up to a maximum of 8.6 bar (125 psig) depending
on pumping requirements.
For best results, the pumps should use a 5µ micron air filter,
needle valve and regulator. The use of an air filter before the
pump will insure that the majority of any pipeline contami-
nants will be eliminated.
SOLENOID OPERATION: When operation is controlled by
a solenoid valve in the air line, three-way valves should be
used, thus allowing trapped air to bleed off and improving
pump performance. Pumping volume can be set by counting
the number of strokes per minute and multiplying by dis-
placement per stroke.
Sound levels are reduced below OSHA specifications using
the standard Wilden muffler element. Other mufflers can be
used but usually reduce pump performance.
ELEVATION: Selecting a site that is well within the pump’s
dynamic lift capability will assure that loss-of-prime troubles
will be eliminated. In addition, pump efficiency can be adversely
affected if proper attention is not given to site location.
PIPING: Final determination of the pump site should not be
made until the piping problems of each possible location have
been evaluated. The impact of current and future installations
should be considered ahead of time to make sure that inad-
vertent restrictions are not created for any remaining sites.
The best choice possible will be a site involving the short-
est and straightest hook-up of suction and discharge pip-
ing. Unnecessary elbows, bends, and fittings should be
avoided. Pipe sizes should be selected so as to keep friction
losses within practical limits. All piping should be supported
independently of the pump. In addition, the piping should
be aligned so as to avoid placing stresses on the pump fit-
tings.
Flexible hose can be installed to aid in absorbing the forces
created by the natural reciprocating action of the pump. If
the pump is to be bolted down to a solid location, a mount-
ing pad placed between the pump and the foundation will
assist in minimizing pump vibration. Flexible connections
between the pump and rigid piping will also assist in mini-
mizing pump vibration. If quick-closing valves are installed
at any point in the discharge system, or if pulsation within
a system becomes a problem, a surge suppressor should
be installed to protect the pump, piping and gauges from
surges and water hammer.
When pumps are installed in applications involving flooded
suction or suction head pressures, a gate valve should be
installed in the suction line to permit closing of the line for
pump service.
For
P1 Plastic models, a non-raised surfaced-flange adapter
should be utilized when mating to the pump’s inlet and
discharge manifolds for proper sealing.
The P1 can be installed in submersible applications
only when both the wetted and non-wetted portions are
compatible with the material being pumped. If the pump is
to be used in a submersible application, a hose should be
attached to the pump’s air and pilot spool exhaust ports and
piped above the liquid level. The exhaust area for the pilot
spool is designed to be tapped for a 1/8" NPT fitting.
If the pump is to be used in a self-priming application, be
sure that all connections are airtight and that the suction lift
is within the model’s ability. Note: Materials of construction
and elastomer material have an effect on suction lift param-
eters. Please consult Wilden distributors for specifics.
Pumps in service with a positive suction head are most efficient
when inlet pressure is limited to 0.5–0.7 bar (7–10 psig).
Premature diaphragm failure may occur if positive suction is
10 psig and higher.
THE MODEL P1 PLASTIC WILL PASS 1.6 MM (1/16") SOLIDS.
WHENEVER THE POSSIBILITY EXISTS THAT LARGER SOLID
OBJECTS MAY BE SUCKED INTO THE PUMP, A STRAINER
SHOULD BE USED ON THE SUCTION LINE.
CAUTION: DO NOT EXCEED 8.6 BAR (125 PSIG) AIR
SUPPLY PRESSURE.
WILDEN PUMP & ENGINEERING, LLC
WIL-10140-E-08
S e c t i o n 6
S U G G E S T E D I N S T A L L A T I O N